Doctor for calender and like smooth rolls



Sept. 1, 1925. @$552,363

F. VV. VICKERY DOCTOR FOR CALENDER AND LIKE SMOOTH ROLLS Filed Dec, l2, 192], 3 Sheets-Sheet l 3 Sheets-Sheet P F. w. VICKI-:RY

DOCTOR FOR CALENDER AND LIKE SMOOTH ROLLS Filed Dec, 12, 1921v Sept. 1, 1925.

Sept. E, B925.

F. w. vlcKERY DOCTOR FOR CALENDER AND LIKE SMOOTH ROLLS Filed DGO. l2 1921 3 Shee'S-Shee Patented Sept. l, 1925.

UNITED STATES 1,552,363 PATENT OFFICE.

FREDERICK WILLIAM VICKERY, OF LONDON, ENGLAND, ASSIGNOR TO VICKERY LIM- ITED, OF BOSTON, MASSACHUSETTS, A CORPORATION F MASSACHUSETTS.

DOCTOR FO'R CALENDER, AND LIKE SMOOTH ROLLS.

Application led December 12, 1921. Serial No. 521,890.

To all whom t may concern:

Be it known that FREDERICK WILLIAM VICKERY, of 49 Bedford Square, London, England, a subject of the King of Great Britain, residing at London, England, has

invented certain new and useful Improvements in Doctors for Calender and like Smooth Rolls, of which the following is a specilication.

My invention relates to doctors for calenderand like smooth rolls. Its object is a doctor with a blade so constructed and supported that its edge can accommodate itself to the surface of the calender or like smooth roll at all parts of its revolution; that is to say, where the surface of the roll is for any reason indented or within the average radius the edge of the blade curves inwards to contact with it, notwithstanding 20 that at the same instant in other parts o the roll there may be projections beyond the average radius passing beneath the edge of the doctor, or the surface of the roll is expanded or otherwise distorted due to temperature variations.

The doctor blade is ultimately borne upon the frame of the machine by a relatively rigid carrying member extending transversely of the machine in proximity to the roll on which the doctor blade bears. In order that the edge of the blade may conform to the surface of the roll as just stated the blade must bend longitudinally and in so doing the several parts of its edge must move transversely to the plane of the blade relatively to the carrying member. Longitudinal bending of the blade involves a shortening of its overall length. I therefore not only make the blade iiexible lengthwise but I so secure itupon the carrier that it is capable of thus shortening its overall length, that is to say, that parts of its edge can move longitudinally relatively to the carrying member, Moreover, I interpose between the edge of the blade and the carrying'member such a width of resilient material as will easily afford the edge the necessary freedom of movement transversely to the general plane of the blade. In a particular construction such necessary width is secured by interposing between the edge of the blade and the carrying member a resilient support of thin metal which is actually or in effect an extension of the width of the blade.

My invention will be clearly understood from the following description aided by the examples of construction shown on the annexed drawings in which- Figure l is a side sectional view of a doctor attached to a bar connectible to a non exible carriage and showing the approximzze position with regard to the vcalender ro s.

Figure 2 is an under planof a portion of a doctor constructed according to my invention the doctor blades being connected to the bar vby separate ngers.

Figure 3 is an under plan of a portion of a doctor and showing means for limiting the end on movement of the doctor blade.

Figures 4 and 5 are sectional side elevations of a doctor and carriage with the end of the finger formed as a springgrip, Figure 4 showing the spring end uncompressed and Figure 5 showing it compressed.

Figure 6 is a plan and Figure 7 an edge view of a device for closing the spaces between the fingers.

Figure 8 is an under plan of a portion of a doctor in which the lingers and doctor blades are formed in one piece of metal with stiil'ening strips which may be employed to increase the tension on the blade.

Figure 9 is a section of same.

According to Figures 1 and 2 I form each linger l of thin strip steel connected to the non flexible carriageor bar 2 preferably by screws 3 and nearthegfre'e end I screw or position a bolt 4 wliicl-'T-carries a nut 4 and between this nut 4 and the strip l the doctor blade 5 has a nice fit so that when the pressure is placed on the doctor blade 5 when on the roll 6 the blade 5 willbe held.

I may provide each finger' with a stil'ening strip which is also engaged by the nut 4 and is somewhat thicker'than the doctor blade 5 to hold the nut 4 the proper distance from the finger to give, clearance for the doctor blade. When, the power required does not need the stiffening strip 7 I may simply employ packing pieces under the nut 4 to keep it at the proper distance togsuit the doctor blade 5 to limit end on movement of the doctor blade 'and yet allow of free expansion and contraction of the doctor blade see Figure 3.

I may also provide or form the end 12 see Figures 4 and 5, of the two end fingers or of two or more other fingers 1 with light springs at 'their ends to press on the doctor blade and hold sam@J to the nut this being useful to hold the doctor blade 5 between the nut 4 and the fingers 1 when such blade is not pressed on to the roll but the springs, when provided, are not of sufficient strengthV to prevent expansion and contraction of the doctor blade.

Any number of fingers may be employed to support the doctor blade, and where, as shown in the present instance, spaces 13 are left between the fingers, and it is desired tol close such spaces and thus prevent any paper or material cleared off the roll by the doctor from falling through said spaces upon any mechanism or material below and at the same time not interfere with the individual elasticity ofthefingers, I enclose each space by a sheet 14 (Figs. 6 and 7) of metal or other material, such sheet resting upon the fingers 1 and bar 2 and close up to 'the doctor blade 5. These sheets 14 fit between the stiffening pieces 7 and to hold them securely to the fingers 1 I rivet to one side of each of said sheets at near the'centre a strip 15 which engages the other side, of the neighbouring fingers 1 and holds the sheet thereto and with such construction of' filling in piece I obtain an uninterrupted surface over the whole of the appliance and the individual springy action of any linger is not interfered with.

Instead of employing separate fingers 1 I may construct the lingers and doctor blade 5 integrally and this is effected, as shown in Figs. 8 and 9 by forming spaces 13 in a strip of metal, the webs between the spaces forming the fingers 1 whilst the back edge 16 is screwed to the carriage 2 to ensure a slidable fit therewith the front edge of the metal stri forming the doctor blade 5. The slidab e fit is ensured by making the holes in the strip through which the screws 3 and Spass, in the form of slots 17. With this construction I may also employ the stiffening pieces 7 as in the previously recited construction and I may fill in the spaces.

In Figures 1 to 9 I have shown the fingers and blade as attached to a bar 2 which it must be understood is afiixable to the non flexible carrier of the machine but such fingers and blade may be aflixed directly to lthe non flexible carriage of the machine.

VVhatI do claim as my invention and desire to secure by Letters Patent is 1. In doctors for calenders and like smooth rolls, -the combination with the roll, of a supporting member substantially parallel with the roll, and a doctor structure comprising a longitudinally bendableJ blade having an edge pressing on said roll, and a width of resilient metal connecting said blade with said support but permitting said blade to bend lengthwise and ladjust itself longitudinally in accordance with such bending.

2. In doctors for calender and like smooth rolls, the combination of a relatively non-flexible carriage adapted to be arranged opposite to the` periphery of the roll, and a doctor structure arranged :in the space between said carriage and the roll and comprising a flexible blade so connected to said carriage that it is free at both edges to twist tortionally about a longitudinal axis relatively to the carriage, an edge of said blade bearing upon the roll.

3. Indoctors for calender and like rolls, the combination of a resilient fiexible doctor blade contacting with the roll, a rigid support substantially parallel with the roll, and

.a plurality of' independent members carr ing said blade and `connecting it to sald support, each adapted to yield elastically in a plane at right angles to said blade, said members permitting relative longitudinal motion of the ends of said blade consequent upon bending of the blade.

4.In doctors for calender and like rolls, y

the combination of' a supporting member adapted to be arranged to extend opposite to the periphery of -the roll, and a blade mounted in the space between said member and the roll and connected to said member whereby said blade will be free to bend both longitudinally and transversely, said blade having an edge which bears on the roll, the blade being so mounted that portions thereof are movable longitudinally with respect to said supporting member.

5. In a doctor for calender and other rolls as claimed in claim 3 devices connecting the doctor blade to certain of said independent supports for holding the doctor blade and allowing it to have an end on expansion movement substantially as and for the purpose set forth.

6. In doctors for calender and like rolls, the combination of a supporting member adapted to be arranged opposite to the periphery of the roll, a width of material in the spacebetween said member and the roll and capable of bending longitudinally and transversely, said width of material comprising an edge portion which bears on the roll and spring fingers which carry said edge portion and are connected to said supporting member.

7. In doctors for calender and like rolls, the combination of a supportinf member adapted to be arranged to extend opposite the roll, said width of material including a'- blade and flexible sup orting means therefor whereby the blade 1s capable of bending longitudinally and transversely relatively tov said member, the blade having an edge portion -which bears on the roll and is movable longitudinally lrelatively to said member.

9. In doctors for calender and like smooth rolls, the combination of a supporting member adapted to be arranged opposite to the roll, a longitudinally and transversely bendable doctor blade having an edge to bear on the roll, fingers connecting said member and the doctor blade, and yieldable compression means connecting some of the fingers to said blade.

10. In doctors for calender and like smooth rolls, the combination of a supporting member adapted to be arrangedwopposite to the roll, a longitudinallyand transversely bendable doctor blade having an edge to bear on the roll, and means yieldable in a direction transverse to the plane of the doctor blade for supporting said blade on said member andrmittin longitudinal movement of the blade relatlvely to said member.

11. In doctors for calender and like smooth rolls, the combination of a supporting member, a doctor blade having an edge adapted to bear on the roll, and flexible fm! gers which carry the Idoctor blade and support it from said memberand permit longiportion tudinal movement ofthe blade relatively to said supporting member.

12. In doctors. for calender and like smooth rolls, the combination of a supporting member, a doctor blade having an edge to bear on the roll, a resilient mounting for said blade fixed to said member and l ieldable transversely of the plane of the lade,

.and means for frictionally mounting the doctor blade on said resilient mounting.

13. In doctors for calender and other rolls, the combination of a supporting member, a doctor blade having an edge adapted to bear 011V the roll, a resilient mounting attached to the su porting member and lapping a portion ofsaid blade, and means for slidably clamping the lapped portions of the blade and resilient mounting.

14. In a doctor for lcalender and like rolls embodying a doctor structure and fingers for pressing an edge of such p structure against the roll, sheetsattachable to the ingers to ll up the spaces between the fingers substantially as and for the purpose set forth. l

. 15. In doctors for calender and like rolls, embodying a doctor structure having an edge portion to engageA the roll and `fingers carrying said edge portion, a sheet having a clip device for holding same to the lingers to 'enclose the space between the fingers substantially as described.

16. In doctors for calender and like smooth rolls, the combination with the roll,

FREDERICK VICKERY. 

